israel. this week's vote will also happen against the backdrop of a fragile cease fire between the israelis and their forces and the militants from hamas. >>> workers cracked open the grave today of the late palestinian leader yasser arafat. it's all part of an investigation into whether somebody poisoned him. assassinated him even. he died in 2004. what killed him is still officially a mystery. israel has denied poisoning him at all. but over the summer, a lab in switzerland detected traces of a radioactive material in stains on his clothing. the current palestinian leader authorized this investigation to determine once and for all what really killed yasser arafat. although getting actual answers could prove very difficult. david lee in our jerusalem news room early wednesday morning. >> getting an answer on how yasser arafat died with reasonable certainty is highly unlikely, but possible. a team of experts this morning took samples of his remains to look for a radioactive substance those ex